<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS动画效果(过渡)</title>
    <script src="../vue.js"></script>
    <style>
        .fade-enter,.fade-leave-to{
            opacity: 0
        }
        .fade-enter-active,.fade-leave-active{
            transition: opacity 3s;
        }
    </style>
</head>
<body>
    <div id="root">
        <transition name="fade">
            <div v-if="show">
                hello world
            </div>
        </transition>
        <button @click="handleClick"> 切换 </button>


    </div>

    <script>
        var vm = new Vue({
            el:"#root",
            data:{
                show:true
            },
            methods:{
                handleClick:function () {
                    this.show = !this.show
                }
            }
        })
    </script>

</body>
</html>